On the opening track to T.I.’s seventh album No Mercy (Dec. 7), Tip, Kanye West, and Kid Cudi invite listeners to a rap trifecta. With its chugging piano melody, burning bass, and repeating hi-hats, “Welcome to the World” finds the incarcerated MC stuttering out lyrics while ‘Ye stretches out his, all while Cudder hums and croons on the chorus. Step into their world below.